| 1. | Unlike the optical spectrum, the X-ray spectrum is quite simple.
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| 2. | In an optical spectrum changbaiite is uniaxial positive and it can be biaxial.
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| 3. | Optical dielectric waveguides guide electromagnetic waves in the optical spectrum ( light ).
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| 4. | What happens to the EM field when the wave is in the optical spectrum?
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| 5. | In the optical spectrum, the H ? is the only clear emission feature.
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| 6. | Only a small part of the optical spectrum is visible to the unaided eye.
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| 7. | NGC 5128 appears in the optical spectrum as a fairly large elliptical galaxy with a prominent dust lane.
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| 8. | Optical spectrum analyzers also exist, which use direct optical techniques such as a monochromator to make measurements.
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| 9. | It was identified as such in 1942, when Rudolf Minkowski found that its optical spectrum was extremely unusual.
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| 10. | The lines were originally observed as dark features ( absorption lines ) in the optical spectrum of the Sun.
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